<!DOCTYPE html>
<html>

<head>
    <meta charset="utf-8">
    <style>
        table {
            color: aqua;
            border: solid 1px;
            border-collapse: collapse;
            width: 50%;
            background-color: black;
            height: 50px;
        }
    </style>
</head>

<body background="https://img2.baidu.com/it/u=2092875828,1868880608&fm=253&fmt=auto&app=138&f=JPEG?w=894&h=350">
    <img src="dog.jpg" width="894" height="350">
    <hr>
    <img src="https://gimg2.baidu.com/image_search/src=http%3A%2F%2Fwx1.sinaimg.cn%2Fmw690%2F006hYGkFly1h7qir4fstsj30iw0e6q3k.jpg&refer=http%3A%2F%2Fwx1.sinaimg.cn&app=2002&size=f9999,10000&q=a80&n=0&g=0n&fmt=auto?sec=1669993865&t=8ba2d5adb589c30735a60095c388437a"
        width="894" height="350">
    <br>
    <a href="http://www.w3school.com.cn/">visit w3school</a>
    <br>
    <a href="1.html">作业</a>
    <br>
    This is my form.
    <form>
        username:<input type="text"><br>
        password:<input type="password"><br>
        nickname:<input type="text"><br>
        telephone:<input type="tel"><br>
        自我介绍：<textarea> Introduce yourself</textarea><br>
        <input type="button" value="注册"><br>
        <input type="button" value="忘记密码"><br>
        <input type="button" value="发送验证码"><br>
        <input type="radio" name="sex">male<br>
        <input type="radio" name="sex">female<br>
        爱好：
        <input type="checkbox" name="hobby">唱歌
        <input type="checkbox" name="hobby">跳舞
        <input type="checkbox" name="hobby">打游戏
        <input type="checkbox" name="hobby">刷视频
        <br>
        班级；
        <select>
            <option>软件9班</option>
            <option>软件10班</option>
            <option>软件11班</option>
            <option>软件12班</option>
            <option>软件13班</option>
        </select>
        <br>

    </form>

</body>

<h1>热爱自然</h1>
<ol>
    <li>和谐</li>
    <li>平等</li>
</ol>

<h2>尊重自然</h2>
<ul>
    <li>美丽</li>
    <li>富强</li>
</ul>

<h3>一个嵌套列表：</h3>
<ul>
    <li>辛苦</li>
    <ul>
        <li>美丽</li>
        <li>富强</li>
    </ul>
    <li>好看</li>

</ul>
This is my table.
<table border="2">
    <colgroup>
        <col span="2" style="background-color:yellow ;" </colgroup>
        <caption>
            学好web
        </caption>
    <tr>
        <th colspan="1">lao</th>
        <th>ku</th>
        <th>sheng</th>
        <th>tian</th>
    </tr>
    <tbody>
        <tr>
            <td rowspan="2">niu</td>
            <td>bi</td>
            <td rowspan="2">ku</td>
            <td>sha</td>
        </tr>
        <tr>
            <td>hao</td>
            <td>xiao</td>
            <td>hui</td>

        </tr>
    </tbody>
</table>






</html>